generally speaking,when(taken)according to the instructions,the drug has no side effect为什么不能taking to take to be taken

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generally speaking,when(taken)according to the instructions,the drug has no side effect为什么不能taking to take to be taken
generally speaking,when(taken)according to the instructions,the drug has no side effect
为什么不能taking to take to be taken

generally speaking,when(taken)according to the instructions,the drug has no side effect为什么不能taking to take to be taken
when后面所跟的动词的主语与主句主语一致.
  when done:表示动作完成后发生主句描绘的情形,与主句主语是被动的关系
  When asked by the police,he said that he remembered nothing .
  when being done:与主句同时发生,主句主语与该动作是被动关系;
  例如 when being laughed at,the boy smiled and walked away.
  when doing:与主句同时发生,主动.
  例如 when doing the exam,we should be careful
  when to do 不适用于这种情况
  when to do 中的不定式表示“什么时候要去做什么事”
  例如 I don't know when to hand in my homework,
因此,在该句子中 “吃药”
drug 和 take 是被动关系,用taken